[otrs] Ldap Auth does not work after upgrade

Hi! I upgraded 2.0 to 2.1 according to the UPGRADING File. Afterwards I copied the Kernel/Config.pm to the new Kernel/ and restarted all. Now Ldap Auth does not work: Tue Oct 17 11:24:20 2006][Error][Kernel::System::Auth::LDAP::Auth][125] First bind failed! No password, did you mean noauth or anonymous ? Any hint for me? lg Martin